I am trying to get a Client to Gateway tunnel to work on the RV042 to a Cisco VPN Client (4.6.01.0019). The RV042 is behind a cable modem and the Cisco VPN client is behind a NATed firewall. I configured a group on the RV042 side with DES/MD5 (I've tried 3DES/SHA1) w/ a Remote Client type of Email Address. On the Cisco VPN client side I am using IPSec over UDP (NAT/PAT) but I've also tried TCP port 10000. I used the group name configured on the router and the pre-shared key for the password. Either way, I can't connect and I am seeing the following error in the VPN log on the RV042: size (869) differs from size specified in ISAKMP HDR (853) What am I doing wrong?